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Tytuł:
Phytochemical and Antifungal Activity of Leaf Extracts of Corchorus olitorius and Gongronema latifolium on Fungi Associated with Post-Harvest Deterioration of Maize (Zea mays) Seeds in Oban Community, Nigeria
Autorzy:
Akwaji, P. I.
Umana, E. J.
Okon, E. I.
Powiązania:
https://bibliotekanauki.pl/articles/1182869.pdf
Data publikacji:
2016
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
phytochemical
antifungal
extracts
maize
fungi
Opis:
This study was carried out to investigate the fungal pathogens associated with post-harvest deterioration of maize seeds in storage in Oban community, Cross River State, Nigeria, determine the effect of the pathogens on the nutritional content of the maize seeds through biochemical analysis as well as evaluate the phytochemical contents and antifungal activity of ethanolic leaf extracts of Corchorus olitorius and Gongronema latifolium in controlling the isolated fungi in vitro. The fungal pathogens isolated as the causative agents of post-harvest deterioration of maize seeds in this study were Penicillium sp., Fusarium sp., Aspergillus sp., and Rhizopus stolonifer. The result of biochemical analysis of fungal infected and non-infected maize seeds carried out showed a significant increase (P ≤ 0.05) in the moisture content of the fungal infected maize seeds as compared to healthy ones (control), while there was a significant decrease (P ≤ 0.05) in the crude fibre, fat, ash, protein and carbohydrate contents of the fungal infected maize seeds as compared to the healthy ones (control). For the in vitro antifungal assay, various concentrations of the extracts ranging from 20g/200ml, 40g/200 ml, 60g/200 ml, 80g/200 ml and 100g/200 ml were separately added to PDA media. Results shows that at 60g/200 ml and 80g/200 ml and 100g/200 ml concentrations, ethanolic leaf extracts of C. olitorius completely inhibited the radial growth of Penicillium sp., Fusarium sp., Aspergillus sp., and R. stolonifer after seven days observation period while those of ethanolic extracts of G. latifolium completely inhibited the redial growth of the fungal pathogens at 40g/200 ml, 60g/200 ml, 80g/200 ml and 100g/200 ml concentrations. Results, however, shows that the extracts had a significant effect (P ≤ 0.05) on the radial growth of the fungal pathogens at all the different concentrations tested as compared with the control. Phytochemical screening of the extracts revealed the presence of cardiac glycosides, reducing sugars, flavonoids, saponnins, tannins, hydocyanin, and anthraquinones with traces of alkaloids.
Źródło:
World Scientific News; 2016, 53, 3; 157-177
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Proangiogenic activity of plant extracts in accelerating wound healing - a new face of old phytomedicines
Autorzy:
Majewska, Iwona
Gendaszewska-Darmach, Edyta
Powiązania:
https://bibliotekanauki.pl/articles/1039823.pdf
Data publikacji:
2011
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
phytomedicines
angiogenesis
wound healing
plant extracts
Opis:
Angiogenesis, the formation of new capillaries from pre-existing vascular network, plays an important role in physiological and pathological processes such as embryonic development, wound healing, and development of atherosclerosis. Extension of the circulatory network is also considered to be one the most important factors during cancerogenesis. Inhibition of angiogenesis may lead to inhibition of tumor growth whereas stimulation may improve wound healing. Research achievements suggest the use of plants and their extracts as potential therapeutic agents with pro- or antiangiogenic activity. Since the anticancer and antiangiogenic properties of many phytomedicines have been amply reviewed elsewhere this paper will focus on the treatment of vascular insufficiency in wound healing. Globally accepted herbal drugs are thought to be safe and effective, however, there is a need for more evidence-based confirmation in controlled and validated trials. Among the most frequently studied proangiogenic phytochemicals are ginsenosides from Panax ginseng, beta-sitosterol from Aloe vera, calycosin from Radix Astragali, and extracts from Hippophae rhamnoides L. and Angelica sinensis.
Źródło:
Acta Biochimica Polonica; 2011, 58, 4; 449-460
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
ANALYTICAL PROCEDURE ELABORATION OF TOTAL FLAVONOID CONTENT DETERMINATION AND ANTIMICROBIAL ACTIVITY OF BEE BREAD EXTRACTS
Autorzy:
Hudz, Nataliia
Yezerska, Oksana
Grygorieva, Olga
Brindza, Ján
Felsöciová, Soňa
Kačániová, Miroslava
Wieczorek, Piotr P.
Powiązania:
https://bibliotekanauki.pl/articles/895653.pdf
Data publikacji:
2019-06-28
Wydawca:
Polskie Towarzystwo Farmaceutyczne
Tematy:
antimicrobial activity
flavonoids
extracts
bee bread
Opis:
SSixteen ethanolic extracts were obtained from seven different bee bread samples. The total flavonoid content in the extracts was determined by aluminium-chloride method and was in the range of 8.3 mg/L±6.24% to 195.3 mg/L±1.35% and 28.8 mg/L±19.33% to 603.3 mg/L±4.64% with reference to quercetin and rutin, respectively. The relative standard deviations (RSD) for parallel measurements for the calibration curves of quercetin dehydrate and rutin trihydrate were in the range of 0.51% to 9.39% and 5.02% to 19.91%, respectively. The RSD for parallel measurements for the extracts with reference to quercetin dihydrate and rutin trihydrate were in the range of 0.23% to 11.64% and 4.64% 19.33%, respectively. The total flavonoid content mainly depended on a ratio of bee bread to 50% ethanol and technology of obtaining bee bread. The significant differences between results were statistically confirmed. The best antibacterial activity of bee bread extracts was found against Bacillus cereus CCM 2010, Clostridium perfringens CCM 4435, and Staphylococcus aureus subsp. aureus CCM 4223. The activity of the bee bread extracts against Gram negative bacteria, Aspergillus and Penicillium genera was lower with moderate anticandidal activity. The obtained results indicated that it was very important to employ extracts with a high content of bee bread in 50% ethanol (1:5, 1:10). According to the results of this study, bee bread is a product which is rich in flavonoids and with good antibacterial activity against Gram positive bacteria and can be considered as a raw material for development of diet supplements and antimicrobial medicinal products
Źródło:
Acta Poloniae Pharmaceutica - Drug Research; 2019, 76, 3; 439-452
0001-6837
2353-5288
Pojawia się w:
Acta Poloniae Pharmaceutica - Drug Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Preparation of Face Wash Using Activated Charcoal and Green Tea Extracts
Autorzy:
Kabra, Kavya
Khan, Ismaeel
Anamika, Paul
Malik, Maham
Mehrotra, Sanjni
Giri, Shipra
Powiązania:
https://bibliotekanauki.pl/articles/1159587.pdf
Data publikacji:
2018
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Activated Charcoal
Facewash
Green Tea Extracts
Opis:
Due to the rapid development of urban cities in the recent decades the level of pollution in the air has increased exponentially, demanding the development of new variants of personal care products. Face being most exposed part of the body, comes in contact with pollution very easily making it difficult to maintain a healthy, bright and clear skin. The facial skin is thinner and more fragile as compared to the rest of the body. A cleansing product specially formulated for face should be used in order to retain the moisture and pH balance of skin. Activated charcoal has properties of deep cleaning and adsorbing impurities. This makes it a favourable ingredient for skin care products. Green tea is flooded with powerful antioxidants for treating acne & scars and also helps in anti-aging. This work aims at the preparation of two face washes. The first is prepared using activated charcoal and green tea extract and the second, without using activated charcoal and green tea extracts. The two face washes are then compared to determine their usability. The aim is to prepare a face wash to combat all the skin issues & to achieve a cleansed, moisturised & glowing face by using ingredients which benefit every skin type.
Źródło:
World Scientific News; 2018, 113; 157-163
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reaction of soybean varieties to natural water extracts in different method of their application
Autorzy:
Piekutowska, Magdalena
Powiązania:
https://bibliotekanauki.pl/articles/1177973.pdf
Data publikacji:
2018
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Artemisia absinthium
Soybean
seed dressing
water extracts
Opis:
The subject of the following study is the reaction of six varieties of soybeans (Glycine max L. Merr.): Abelina, Augusta, Merlin, Mavka, Aligaor, Lisabon, on an aqueous decoction of dried Artemisia absinthium L. used as wet seed treatment. The experiment was carried out in a greenhouse belonging to the Experimental Station for Variety Testing in Karzniczka. Two combinations of the extract were used: 24h soaking of seeds in the decoction followed by sowing and soaking in distilled water followed by sowing, but untreated seeds with simultaneous dosing of herbal extract. The control group were seeds not treated with preparations. After sixteen days of the test, the average number of plant growth was determined for each experimental combination. The morphological characteristics of the seedlings: length of shoots and roots as well as fresh and dry mass of shoots and roots were evaluated for ten randomly selected plants from each experimental combination. The results of the greenhouse experiment showed different reaction to the application of the decoction in the form of a seed treatment. Soil application of the extract led to the improvement of soybean growth. Seedlings of all varieties, the seeds of which were treated and sown, developed a longer and stronger root system at the expense of a slight reduction in the length and weight of the shoots. The 24h soaking of seeds in the decoction of Artemisia absinthium caused the deterioration of emergence and the visible inhibition of the growth and development of soybean seedlings. The inhibition of germination and emergence by the tested extract excludes the possibility of agricultural application. Further research is needed to identify the bioactive compounds contained in the used decoction and to assess the real effectiveness of the soil application of the extracts under field conditions.
Źródło:
World Scientific News; 2018, 96; 13-24
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Effects of Water Extracts from Tansy on Pea Leaf Weevil and Black Bean Aphid
Autorzy:
Kwiecień, Natalia
Gospodarek, Janina
Boligłowa, Elżbieta
Powiązania:
https://bibliotekanauki.pl/articles/123251.pdf
Data publikacji:
2020
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
water extracts
Tanacetum vulgare L.
biological control
Opis:
The purpose of the research conducted was to define the impact of the various aqueous extract concentrations, prepared from the dried (in concentrations 2%, 5% and 10%) and fresh (in concentrations 10%, 20% and 30%) tansy (Tanacetum vulgare L.) mass, on the feeding of pea leaf weevil (Sitona lineatus L.), and the mortality rate of black bean aphid (Aphis fabae Scop.). The studies showed that in order to limit the feeding of pea leaf weevils considerably, it is necessary to use at least 5% extract of the dried tansy mass or 20% extract of the fresh tansy mass. The impeding effect on the feeding of pea leaf weevils was correlated positively with the extract concentration. The insecticide effect of the aqueous extract of tansy on black bean aphid was revealed not earlier than after 12 hours with the use of at least 20% extract of the fresh tansy mass and 5% extract of the dried mass (only in relation to aphid larvae). Nevertheless, the extracts of lower concentration also demonstrated the insecticide effectiveness although delayed (36–60 hours after the application). As compared to other studies conducted according to the same methodology, it was demonstrated that the tansy aqueous extracts are characteristic for a high deterrent activity in relation to the pea leaf weevil beetles (higher than the extracts of absinthe and similar to the extracts of pepper mint and sage) and a quite high aphicidal activity (higher effectiveness than in the case of the aqueous extracts of lemon balm but lower than the extracts of tarragon and absinthe).
Źródło:
Journal of Ecological Engineering; 2020, 21, 3; 220-227
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Water Extract From Mint on Selected Crop Pests Feeding and Survival
Autorzy:
Biniaś, B.
Gospodarek, J.
Rusin, M.
Powiązania:
https://bibliotekanauki.pl/articles/124262.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
biological control
Mentha piperita L
plant extracts
Opis:
The aim of the study was to determine the effect of aqueous extracts of dried mint (Mentha piperita L.) in concentrations of 2%, 5% and 10%, and fresh parts of this plant, in concentrations of 10%, 20% and 30% on feeding of pea leaf weevil (Sitona lineatus L.) and survival of black bean aphid (Aphis fabae Scop.) on the leaves of broad bean (Vicia faba L.), variety “Bartek”. In the studies of the effects of aqueous extracts of mint on the dynamics of Sitona lineatus feeding on the beans leaves, 9 laboratory’s observations in 12-hour intervals was made. Leaves injuries on their edge surface caused by adult individuals were measured. Observations were carried out in 6 replicates divided into males and females. In these researches on impact of water extracts from mint on mortality of wingless females and larvae of black bean aphids, 14 laboratory’s observations in the 8-hour intervals was made. Aqueous extracts of dry and fresh peppermint significantly limited the feeding of pea leaf weevil females, and the extracts from dried material were more effective. Extracts from peppermint caused mortality of black bean aphid larvae compared to wingless females to a greater extent, and the higher the concentration of the extract, the more beneficial effect was observed. An extract from dried material at a concentration of 2% was too weak to effectively combat the larvae of A. fabae, while in the case of aphid females, an effectiveness was only demonstrated for the extracts at the highest concentrations, i.e., 10% of dried and 30% of fresh peppermint.
Źródło:
Journal of Ecological Engineering; 2017, 18, 2; 119-128
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An in vitro assessment of antiviral activity for ethanol extract of Desmodium canadense against bovine herpesvirus type 1
Autorzy:
Lelešius, R.
Girdauskaitė, P.
Karpovaitė, A.
Mickienė, R.
Drevinskas, T.
Tiso, N.
Ragažinskienė, O.
Kubilienė, L.
Maruška, A.
Šalomskas, A.
Powiązania:
https://bibliotekanauki.pl/articles/2087312.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
bovine herpesvirus 1
plant extracts
Desmodium canadense
Źródło:
Polish Journal of Veterinary Sciences; 2020, 23, 2; 177-184
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
In vitro antioxidant and antibabesial activities of the extracts of Achillea millefolium
Autorzy:
Guz, L.
Adaszek, Ł.
Wawrzykowski, J.
Ziętek, J.
Winiarczyk, S.
Powiązania:
https://bibliotekanauki.pl/articles/2087537.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
yarrow
plant extracts
babesiosis
tick borne diseases
Źródło:
Polish Journal of Veterinary Sciences; 2019, 2; 360-376
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Biogenesis of Zinc Oxide Nanoparticles using Couroupita guianensis Aubl. Extracts - A Green Approach
Autorzy:
Manokari, M.
Shekhawat, Mahipal S.
Powiązania:
https://bibliotekanauki.pl/articles/1193027.pdf
Data publikacji:
2016
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Couroupita guianensis
Zinc oxide nanoparticles
aqueous extracts
characterization
Opis:
Zinc oxide nanoparticles (ZnO NPs) were synthesized by the green synthesis methods using aqueous extracts of Couroupita guianensis Aubl. This is an eco-friendly, time conservative and cost effective way of nanoparticle production. The aqueous extracts of leaves, stem, flower petals and bark were used to synthesize the nanoparticles. Zinc Nitrate hexahydrate (Zn (NO3)2•6H2O) was used as a precursor material. The prepared Zinc oxide nanoparticles were characterized using UV-Vis spectrophotometric analysis. The wavelength specific UV-Vis absorption peaks for Zinc oxide nanoparticles were recorded between 290 nm to 302 nm which confirmed the presence of Zinc oxide in nano scale. The reaction mixture with aqueous extract of leaf showed maximum absorbance spectral peak at 302 nm, stem at 294 nm, flower petals at 292 nm and bark at 288 nm. This is the first report to explore the use of Couroupita guianensis for the biogenic production of Zinc oxide nanoparticles to meet the demand of the pharmaceutical, medicinal and environmental industries.
Źródło:
World Scientific News; 2016, 29; 86-95
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The determination of alignment elements of mining hoist brake actuators
Autorzy:
Lipecki, T.
Powiązania:
https://bibliotekanauki.pl/articles/225552.pdf
Data publikacji:
2011
Wydawca:
Politechnika Warszawska. Wydział Geodezji i Kartografii
Tematy:
wyciągi górnicze
skanowanie laserowe
mining extracts
laser scanner
Opis:
This paper presents a method of control of geometry of mining hoist brakes. To assess the relative positions and axiality of components, precise leveling and laser scanning were used. There were also presented the methods of its analysis, as well as the reasons of the malfunctioning operation of the equipment. The tests carried out showed that, for geometric assessment of this type of mechanical equipment, such methods should be used with surveying, which allow you to recreate any element of machine at virtual space. One of these methods is laser scanning.
Źródło:
Reports on Geodesy; 2011, z. 1/90; 257-264
0867-3179
Pojawia się w:
Reports on Geodesy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Antioxidant and antimicrobial potentials of mycelial extracts of Hohenbuehelia myxotricha grown in different liquid culture media
Autorzy:
Krupodorova, T.
Barshteyn, V.
Sevindik, M.
Powiązania:
https://bibliotekanauki.pl/articles/2096244.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
antioxidant
oxidant
antimicrobial
ethanolic extracts
mycelium
Hohenbuehelia myxotricha
Opis:
In addition to their nutritional properties, mushrooms have emerged as a health supplement because of their medicinal potential. Many studies have shown that mushrooms exhibit important biological activities. Here, the antioxidant and antimicrobial activities of Hohenbuehelia myxotricha (Lév.) Singer mycelia cultivated on Sabouraud dextrose broth (SDB) and glucose peptone yeast (GPY) medium were studied. The total antioxidant status (TAS), total oxidant status (TOS), and oxidative stress index (OSI) of ethanolic extracts of mycelia were measured using Rel Assay kits. The antioxidant and oxidant potentials of H. myxotricha mycelial extracts were determined for the first time in the present study. The highest TAS, TOS, and OSI values of H. myxotricha were 5.416 ± 0.150 mmol/l, 1.320 ± 0.156 μmol/l, and 0.024 ± 0.003, respectively. Ethanolic mycelial extracts of H. myxotricha showed antimicrobial activities at concentrations from 25 to 200 μg/ml against all the studied bacteria (Acinetobacter baumannii, Enterococcus faecalis, Escherichia coli, Staphylococcus aureus, methicillin-resistant S. aureus, and Pseudomonas aeruginosa ) and fungi (Candida albicans, C. glabrata, and Issatchenkia orientalis ) tested by the agar dilution method. The antifungal activity of the extract was more significant than its antibacterial activity. The antioxidant, oxidant, and antimicrobial potentials of H. myxotricha mycelia varied depending on the culture media used. GPY medium was more suitable for the synthesis of antibiotic compounds against E. coli, while SDB medium was more appropriate for producing metabolites with antioxidant and antifungal properties. Based on the results, ethanolic extract of H. myxotricha mycelia showed a significant pharmacological potential and could be used as a natural antioxidative and antimicrobial source for health benefit.
Źródło:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2022, 103, 1; 19-28
0860-7796
Pojawia się w:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessment of Phytotoxic Potential of Potato Genotypes
Autorzy:
Sołtys-Kalina, Dorota
Powiązania:
https://bibliotekanauki.pl/articles/2199679.pdf
Data publikacji:
2017-06-20
Wydawca:
Instytut Hodowli i Aklimatyzacji Roślin
Tematy:
allelopathy
glycoalkaloids (TGA)
leaf extracts
mustard
test plant
Opis:
In the laboratory studies on allelopathy, phytotoxicity is defined as a negative impact of plant’s extracts or natural compounds derived from plants, on germination and/or growth of the tested (acceptor) plant. Glycoal-kaloids are the main biologically active compounds of the potato and are involved in potato phytotoxicity (the correlation coefficient of the length of the test plant with the concentration of total glycoalkaloids present in the leaf extracts of forty potato genotypes was r = -0.41). The assessment of phytotoxic abilities of the potato is a two-step procedure which consists of determining glycoalkaloids in potato leaf extracts and analyzing the root and hypocotyl lengths of the test plant growing in potato leaf extracts.
Źródło:
Plant Breeding and Seed Science; 2017, 75; 17-22
1429-3862
2083-599X
Pojawia się w:
Plant Breeding and Seed Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Total Phenolic, Flavonoid Contents and Antioxidant Activities of Honey and Propolis Collected from the Region of Laghouat (South of Algeria)
Autorzy:
Bakchiche, Boulanouar
Habati, Mounir
Benmebarek, Ahmed
Gherib, Abdelaziz
Powiązania:
https://bibliotekanauki.pl/articles/1114189.pdf
Data publikacji:
2017
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Antioxidant Activity
DPPH
FRAP
Honey
Phenolic Extracts
Propolis
Opis:
The aim of this study was to determine total phenolic and flavonoid contents and to evaluate the antioxidant activities of two honeys and one propolis sample, collected from the region of Laghouat (South of Algeria). Total phenolic content were determined by using Folin-Ciocalteu reagent as gallic acid equivalent, while flavonoids content was assessed by means of the AlCl3 method as Rutin equivalent. Antioxidant activities of the honeys and propolis were examined by two different methods, namely, scavenging of free radical 2,2-diphenyl-1-picrylhydrazyl and reducing power. The antioxidant activities were compared with standard antioxidants such as Ascorbic acid, BHT and Trolox. The highest level of phenolic was 2385 mg Gallic acid per 100g sample, the highest level of flavonoid was 379 mg Rutin per 100g sample, while the highest protein content was 1177 mg per 100g sample, DPPH (0.026 mg/ml) and TEAC (0.0015) were detected especially in the propolis sample, indicating that it holds good antioxidant properties. A strong positive correlation was found between phenolics, flavonoids, DPPH and TEAC, indicating that in addition to total phenolic content, flavonoid and protein concentrations are good indicators of the antioxidant potential of propolis and honey.
Źródło:
World News of Natural Sciences; 2017, 11; 91-97
2543-5426
Pojawia się w:
World News of Natural Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Iron, Zinc, Copper, Manganese and Chromium in Green Teas, Their Transfer to Extracts and Correlations between Contents of Elements and Bioactive Compounds
Autorzy:
Herman, Małgorzata
Janiak, Michał A.
Sadlik, Józefa K.
Piekoszewski, Wojciech
Amarowicz, Ryszard
Powiązania:
https://bibliotekanauki.pl/articles/2152159.pdf
Data publikacji:
2022-11-22
Wydawca:
Instytut Rozrodu Zwierząt i Badań Żywności Polskiej Akademii Nauk w Olsztynie
Tematy:
green tea
extracts
Cu
Fe
Zn
Mn
Cr
Opis:
Green tea is used worldwide in the preparation of beverages, but also its extracts rich in bioactive compounds, especially flavan-3-ols, are of increasing interest. In addition to bioactive molecules, green tea represents a source of dietary elements. However, knowledge about their content in extracts is limited. The aim of our research was to determine the extent of transfer of selected elements, i.e., iron (Fe), zinc (Zn), copper (Cu), manganese (Mn), and chromium (Cr), from green teas to their extracts and to investigate whether the main bioactive compounds of the extracts affect this transfer. Twelve commercially available green teas were used in the study. The contents of elements in green teas and their extracts obtained with 80% acetone (v/v) were analysed by inductively coupled plasma optical emission spectroscopy (ICP-OES). High performance liquid chromatography in reverse phase (RP-HPLC) was used to determine contents of caffeine, (–)-epigallocatechin (EGC), (–)-epicatechin (EP), (–)-epigallocatechin gallate (EGCG), and (–)-epicatechin gallate (ECG). The element with the highest content in green teas was Mn (711–1402 µg/g), but its transfer to extracts was the lowest (0.269–0.646%). The mean Fe transfer, second abundant element in teas (115–725 µg/g), was 5.52%. The contents of Mn and Fe in extracts were 5.08–30.2 and 10.7–90.1 µg/g, respectively. Zn, Cu, and Cr were transferred with means of 10.4, 20.0, and 26.2%, respectively, which resulted in their contents in the extracts in the ranges of 5.03–12.6, 1.93–13.8, and 0.128–2.03 µg/g, respectively. The significant positive correlations of Zn content in extracts and/or transfer to extracts with EGCG, EGC and total flavan-3-ols as well as between the same Fe variables and EGC were determined, which suggested that these flavan-3-ols may positively affect the transfer of Fe and Zn from green tea to extracts. In turn, significant but negative correlations were found in the case of Mn and Cu. Future research is needed to identify the causes of the various transfer rate of elements from green teas to extracts.
Źródło:
Polish Journal of Food and Nutrition Sciences; 2022, 72, 4; 421-429
1230-0322
2083-6007
Pojawia się w:
Polish Journal of Food and Nutrition Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
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